devkit-disks-daemon is causing this by polling CD drives. The following command 
will prevent the tray from closing:
sudo devkit-disks --inhibit-all-polling

After hitting CTRL-C, polling resumes and the tray will close again.

** Summary changed:

- Unable to eject DVD tray
+ CD-ROM tray closes automatically after eject

-- 
CD-ROM tray closes automatically after eject
https://bugs.launchpad.net/bugs/423752
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